Whilst managing urban tree populationsin London during my day job, I come across a wide range of tree-associated fungi throughout the year. One of the most interesting tree/fungus associations I have had the pleasure of observing is that of oak (Quercus robur/petraea) and the late summer fruiting beefsteak fungus (Fistulina hepatica). It is known to associate with other tree species, most notably sweet chestnut (Castanea sativa), and a quick scan across the more recent of the 35 pages of its FRD